Machine for trimming the edges of strips of wood of variable widths



July 25, 1950 G. L. BJORK- 2,516,176

MACHINE FOR TRIMMING THE EDGES OF STRIPS OF woon 0F VARIABLE wID'ms 2 Sheets- Sheet 1 I N VEN TOR.

Filed July 3, 1946 Patented July 25, 1950 STRIPS OFWQOD F VARIABLE .WIDTHS 1 a 2- Claims. (01. 1444i?) This invention relates to a movable cutter head adapted for use with a machine for jointing shingles and box material.

An object of this invention is to provide a movable cutterhead that is designed to plane edges on lumber or shingles, varying in width from three to sixteen inches.

Another object of this invention is to provide a movable cutterhead that is mounted on a single pivoted bracket with the operating motor for the cutterhead in the center of the pivot for the bracket, thus as the bracket pivots the same tension is provided on the drive belt at all times.

With the above and other objects and advantages in view, the invention consists of the novel details of construction, arrangement and combination of parts more fully hereinafter described, claimed and illustrated in the accompanying drawings in which:

Figure 1 is a top plan view;

Figure 2 is a side view thereof;

Figure 3 is an end view thereof;

Figure 4 is a side view of the movable cutterhead;

Figure 5 is a top plan view thereof and Figure 6 is a sectional view on the line 6-6 of Figure 5.

Referring more in detail to the drawing, the reference numeral l6 designates generally the machine on which an embodiment of the invention is mounted. The machine comprises the bed l2 over which the work feeding chain conveyor l4 travels longitudinally thereof, and the chain is mounted on sprockets IS, the axles of which are journalled in bearings l8 secured to the ends of the machine l0.

Mounted on the machine Ill is a bracket 26 for mounting the motor 22, and the pivot 26 for the arm 24 and a ball-bearing race 28 permits free movement of the arm on the pivot 26. At the outer end of the arm 24, the spindle 30 is mounted in ball-bearing races 32 in the tubular spindle bearing housing 34, and the spindle is provided at its upper end with the cutterhead 36 secured thereon by the nut 38, and at the lower end with a V-pulley 46 having a belt drive connection 42 with the V-pulley 44 on the drive shaft of the motor 22.

The housing 34 is mounted in the tubular member 46 retained thereon by the nut 48 and the member 46 is mounted by bearings 56 in the collar 52 having the annular flange 54 which is engaged by a circular flanged member 56 which secures the assembly previously described to the arm 24 by fasteners 58. secured to the housin 3 y a set screw 66 is the ring portion 62 of the lever arm 64, having a pivot 66 on the outer end thereof, having a ball-bearing 68 thereon for mounting the rod 16, which at the other end is mounted by means of the ball-bearing pivot 12 on the bracket 20, and this rod holds the guide 14 and cutterhead 36 in parallel relation to the straight edge 16 along the outer longitudinal edge of the bed l2.

The guide M comprises the curved hinged arm l8 which is tensioned by the spring 86, and the arm and spring are secured to the handle 82 secured to the bracket 83 on the lever arm 64, and the handle controls the movement of the cutterhead. The arm 18 forces the spring 80 toward the handle when the work A, B or C is passing through the machine and the edges contacting the guide are not parallel. It will be noted that movement of the cutterhead by the handle 82 is accomplished by means of the arcuate slot 84 in the bed l2. The arm 24 and the cutterhead assembly are supported by the Y-shaped brace 86 secured to the arm at its forked end and to the bracket 20 at its opposite end. The arm 24 has a bracket 68 thereon for mounting the locking arm 90 in the ball-bearing pivot 92 and the arm is received in the cam locking means 94, on the machine, for locking the arm and cutterhead in fixed relation to the line of travel of the work during the operation of the machine, and the lock may be released to move the arm as desired for various widths of work.

During operation, the cutterhead is moved with relation to the straight edge 16, and locked in place by means of the rod 96, then as the work passes over the bed l2, carried by the chain conveyor Hi, the cutter engages the work for the planing thereof. Each time the work varies in width, the position of the cutterhead is changed and the guide 58 engages the edge of the work being planed.

It is believed that the operation and construction of this invention will be apparent to those skilled in the art, and it is to be understood that changes in the details of construction, arrangement and combination of parts may be resorted to, provided they fall within the spirit of the invention and the scope of the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a machine for trimming the edges of strips of wood of variable widths, means for supporting a bed plate which is provided with an elongated, arcuate aperture for receiving therethrough a cutter head, bracket means mounted beneath the bed plate, a driving motor supported by the bracket means, with its shaft disposed vertically, an elongated arm pivoted on :the bracket means, coaxially with the motor shaft, a cutter head supported at the remote end of the elongated arm, in position to extend through the arcuate aperture in the bed plate, conveyor means driven by the motor for continuously feeding work pieces over the aperture in the bed plate, in position for edge trimming by the cutter head, a

fixed workpiece guide mounted on the bed plate along one longitudinal edge thereof, an adjustable workpiece guide supported on an extension of the means for supporting the cutter head, in position to cooperate with an opposite edge portion of the work piece, and means for securing the adjustable workpiece guide in one. of a plurality of positions of adjutment.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED s'rrirns' PATENTS Number Name Date 413,073 Luther Oct. 15, 1889 626,718 Pearson et a1 June 13, 1899 704,373. Rawson July 8, 1902 15 1,76 9 125 Erickson July 1, 1930 4 Fo EIGN PATENTS Number Country Date 382352 France Dec. 7, 1907 

